American Apparel Inc. on Monday unveiled plans to cut costs by closing underperforming stores and streamlining its workforce as the retailer looks to turn around its flagging business.

American Apparel said the moves, which are expected to save $30 million over the next 1 1/2 years, are aimed at helping the company adapt to headwinds in the retail industry and preserving jobs for the "overwhelming majority" of its 10,000 employees.

The Los Angeles-based retailer noted that even if it succeeds in growing revenue and cutting costs, there is no guarantee that it will have sufficient financing to meet its funding requirements for the next year without raising additional capital.

American Apparel's stock has fallen dramatically since peaking at nearly $17 a share in late 2007. Shares, inactive premarket, closed at 50 cents on Thursday, down about 52% this year.

American Apparel also said Monday that it would launch a new fall merchandise line—a first for the company.

"Historically, the fall season has not been a major focus for the company," said Chief Executive Paula Schneider, who was appointed to the role in January. "The new styles are designed to increase revenue as we continue to evolve our product offering during this important selling season."

The moves come as American Apparel's sales have been on a steady decline and it continues its tussle with the company's former chief executive, Dov Charney.

Mr. Charney, who was terminated in December following allegations of misconduct and of violating company policy, has filed a string of lawsuits against his former employer.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

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